﻿/***************************************************************************
*                            QueuedMemoryWriter.cs
*                            -------------------
*   begin                : December 16, 2010
*   copyright            : (C) The RunUO Software Team
*   email                : info@runuo.com
*
*   $Id: QueuedMemoryWriter.cs 645 2010-12-23 11:36:25Z asayre $
*
***************************************************************************/








/***************************************************************************
*
*   This program is free software; you can redistribute it and/or modify
*   it under the terms of the GNU General Public License as published by
*   the Free Software Foundation; either version 2 of the License, or
*   (at your option) any later version.
*
***************************************************************************/
using System;
using System.Collections.Generic;
using System.IO;

namespace Server
{
    public sealed class QueuedMemoryWriter : BinaryFileWriter
    {
        private readonly MemoryStream _memStream;
        private readonly List<IndexInfo> _orderedIndexInfo = new List<IndexInfo>();
        public QueuedMemoryWriter()
            : base(new MemoryStream(1024 * 1024), true)
        {
            this._memStream = this.UnderlyingStream as MemoryStream;
        }

        protected override int BufferSize
        {
            get
            {
                return 512;
            }
        }
        public void QueueForIndex(ISerializable serializable, int size)
        {
            IndexInfo info;

            info.size = size;

            info.typeCode = serializable.TypeReference;	//For guilds, this will automagically be zero.
            info.serial = serializable.SerialIdentity;

            this._orderedIndexInfo.Add(info);
        }

        public void CommitTo(SequentialFileWriter dataFile, SequentialFileWriter indexFile)
        {
            this.Flush();

            int memLength = (int)this._memStream.Position;

            if (memLength > 0)
            {
                byte[] memBuffer = this._memStream.GetBuffer();

                long actualPosition = dataFile.Position;

                dataFile.Write(memBuffer, 0, memLength);	//The buffer contains the data from many items.

                //Console.WriteLine("Writing {0} bytes starting at {1}, with {2} things", memLength, actualPosition, _orderedIndexInfo.Count);

                byte[] indexBuffer = new byte[20];

                //int indexWritten = _orderedIndexInfo.Count * indexBuffer.Length;
                //int totalWritten = memLength + indexWritten

                for (int i = 0; i < this._orderedIndexInfo.Count; i++)
                {
                    IndexInfo info = this._orderedIndexInfo[i];

                    int typeCode = info.typeCode;
                    int serial = info.serial;
                    int length = info.size;

                    indexBuffer[0] = (byte)(info.typeCode);
                    indexBuffer[1] = (byte)(info.typeCode >> 8);
                    indexBuffer[2] = (byte)(info.typeCode >> 16);
                    indexBuffer[3] = (byte)(info.typeCode >> 24);

                    indexBuffer[4] = (byte)(info.serial);
                    indexBuffer[5] = (byte)(info.serial >> 8);
                    indexBuffer[6] = (byte)(info.serial >> 16);
                    indexBuffer[7] = (byte)(info.serial >> 24);

                    indexBuffer[8] = (byte)(actualPosition);
                    indexBuffer[9] = (byte)(actualPosition >> 8);
                    indexBuffer[10] = (byte)(actualPosition >> 16);
                    indexBuffer[11] = (byte)(actualPosition >> 24);
                    indexBuffer[12] = (byte)(actualPosition >> 32);
                    indexBuffer[13] = (byte)(actualPosition >> 40);
                    indexBuffer[14] = (byte)(actualPosition >> 48);
                    indexBuffer[15] = (byte)(actualPosition >> 56);

                    indexBuffer[16] = (byte)(info.size);
                    indexBuffer[17] = (byte)(info.size >> 8);
                    indexBuffer[18] = (byte)(info.size >> 16);
                    indexBuffer[19] = (byte)(info.size >> 24);

                    indexFile.Write(indexBuffer, 0, indexBuffer.Length);

                    actualPosition += info.size;
                }
            }

            this.Close();	//We're done with this writer.
        }

        private struct IndexInfo
        {
            public int size;
            public int typeCode;
            public int serial;
        }
    }
}